Upgrading to Coil on Plugs (all years) COP writeup - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Useful Saved Posts Useful info, FAQs, anything you don't want to get purged.

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 11-27-2014, 05:31 PM   #41
Sadfab Union President
iTrader: (3)
 
Join Date: May 2014
Location: Kansas
Posts: 2,690
Total Cats: 114
Default

Yeah, I think you are right. From the 1.8 up, the megasquirt drives the tach. On the stock 1.6, the dash tach is driven off the ignitor, the DIYPNP jumper configuration doesn't have a connection for the tach, in stock configuration at least.

I'll definitely try a resistor if I don't get a tach signal from just splicing the two together. Thanks for the heads up.
deezums is offline   Reply With Quote
Old 11-27-2014, 05:33 PM   #42
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 16,414
Total Cats: 1,162
Default

Quote:
Originally Posted by deezums View Post
Yeah, I think you are right. From the 1.8 up, the megasquirt drives the tach. On the stock 1.6, the dash tach is driven off the ignitor, the DIYPNP jumper configuration doesn't have a connection for the tach, in stock configuration at least.

I'll definitely try a resistor if I don't get a tach signal from just splicing the two together. Thanks for the heads up.
I spliced them and didn't rewire Pin 2I (I just forgot to) and got no tach, added the resistor and boom, tach.

I don't think rewiring 2I to tach out is the way to go. By connecting the black/white and the blue and yellow you are connecting the tach signal to the tach input. Then the resistor provides a pull-up that the tach needs. I would need to go over the diagrams to be sure but you might end up with some weird stuff by driving IG- with the coils (ground signal) and the ECU.

Joe Perez or Braineack what do you think. I've been spending too much time with embedded code and EE knowledge is rusty.
aidandj is offline   Reply With Quote
Old 11-27-2014, 10:30 PM   #43
Sadfab Union President
iTrader: (3)
 
Join Date: May 2014
Location: Kansas
Posts: 2,690
Total Cats: 114
Default

I looked through your thread again, are you still using toyota COPs? If so, they make a signal that replicates the one you removed in the stock ignitor. The LS2 truck coils have no tach out signal, so my megasquirt has to make the signal or there's no signal to pull up.

That's my understanding, if you wanted you could probably ditch the tach out pin of the toyota cops and drive the tach directly off the MS. I'm curious if it will be more accurate. I noticed it does very odd things under spark cut stock, obviously, I'm curious if the tach will read identical to megatune while on launch control or a flat shift, boost cut etc. Not a huge deal obviously, but I can't help but mess with stuff.

I'm waiting for a trashed ignitor to finish my setup 100%, I'll be back with results no matter what.
deezums is offline   Reply With Quote
Old 11-27-2014, 10:31 PM   #44
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 16,414
Total Cats: 1,162
Default

Quote:
Originally Posted by deezums View Post
I looked through your thread again, are you still using toyota COPs? If so, they make a signal that replicates the one you removed in the stock ignitor. The LS2 truck coils have no tach out signal, so my megasquirt has to make the signal or there's no signal to pull up.

That's my understanding, if you wanted you could probably ditch the tach out pin of the toyota cops and drive the tach directly off the MS.
Haha you are right, I totally missed that. Go ahead with your plan that sounds perfect.
aidandj is offline   Reply With Quote
Old 11-29-2014, 02:05 AM   #45
Sadfab Union President
iTrader: (3)
 
Join Date: May 2014
Location: Kansas
Posts: 2,690
Total Cats: 114
Default

My plan works, and so do my coils. Stock wires were "crimped" to fit on the thinner LS studs. I ran a flat blade screwdriver between the coil boot and wire to un-glue them so I could make them fit perfect.



Attached Thumbnails
Upgrading to Coil on Plugs (all years) COP writeup-img_20141129_005429_zps075d6140.jpg   Upgrading to Coil on Plugs (all years) COP writeup-img_20141129_005401_zpsd894ac06.jpg  
deezums is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 53 12-07-2016 04:52 PM
Changing from 460cc to flow force 610cc in diypnp 90 Turbo MEGAsquirt 19 10-19-2015 03:23 PM
Noob to Miataturbo from MA JxPhan Meet and Greet 3 10-02-2015 02:17 AM
01-05 Fab9 PNP COPs (used) FrankB Miata parts for sale/trade 6 09-30-2015 11:48 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:34 PM.